Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e3ba3b0ab12411…

MALICIOUS

PDF

73.0 KB Created: 2021-09-04 11:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7e1998d61e5d930f46e6157928fcdfb1 SHA-1: 4eb5c4671b599f6e2f75fe54bb6dd7ea02083ad5 SHA-256: c4e3ba3b0ab12411bf322f605d525e2ce44c157b923ac113fbc033a6b61f4854
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of numerous embedded URLs indicates a strong intent to lead the user to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c0663ed7a95---80152180422.pdf In PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92103863150.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dd294f10e---22269456810.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210731_0E4DADAE0D0134E6.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/18095909696.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/5afc798812231417337d64851031c0ca/44633721412.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/44409318839.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/067d193a23c95c0cfee5d2e44ed51a7a/74823164220.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/tabopug.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8898a860c9---43495072467.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/sariwepurajudorodewuti.pdfIn PDF document text
    • https://banghenails.com/upload/file/tesefibesetuzof.pdfIn PDF document text
    • http://360global.ca/userfiles/file/dexuxevum.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/19752589645.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/26051022185.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/61853885834.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fc99725d6---66532260630.pdfIn PDF document text
    • http://orlickachata.cz/files/files/7872253387.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609231900914c---61955670339.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/xebagobixa.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/jajesegadiwumapawigale.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/01573116edbe99813773d73acc8422d9/5330587530.pdfIn PDF document text
    • http://weclassof86.com/clients/6/6d/6dc59c75684a9be5e3a4726337e2fa3a/File/leduzajogev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=droit+constitutionnel+francais+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC19 16544 bytes
SHA-256: 32ceee161b303a21e5dc4a527a41e899ab13d754419c6903f1ff3e951404f663
font_01_sfnt_off0000e5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF8 10712 bytes
SHA-256: 33e62b79d88f345961004747457b6d753be47709f15a03fc0bc46f9fd6e3a091

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